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// Access bash from postgres container
docker exec -it <DOCKERCONTAINER_NAME> bash

// Access with defined user in docker-compose.yaml
psql -U postgres

version: "3.1"

services:
  db:
    image: postgres:alpine
    restart: always
    environment:
      POSTGRES_PASSWORD: postgres
      POSTGRES_USER: postgres
    ports:
      - 5432:5432